just follow these easy steps
There are quite a few other manual methods to make usb devices bootable as discussed here, once you succeed in making your USB drive bootable using any of the method discussed above, You need to change the boot-up setting in the system BIOS as described below to boot using your portable device:
- With your device inserted, restart the machine.
- Enter the BIOS setup menu to change the boot device setting.
- If the boot-up files are created in the USB drive, select USB-HDD or USB-ZIP (preferred). If the boot-up files are created in the floppy drive of your device, select USB-FDD (for Pen Drive that supports security mode).
- Save and exit the BIOS setup. You should be able to boot up with you USB device.
